package com.dp.interceptor;


import com.dp.utils.UserHolder;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * @author KT917
 * @date 2022/11/17
 */
public class LoginInterceptor implements HandlerInterceptor {



    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // TODO 1.判断是否需要拦截 （ThreadLocal 中是否有用户）
        if (UserHolder.getUser()==null){
            //没有需要拦截
            response.setStatus(401);
            //拦截
            return false;
        }
        //有用户放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
